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Thereisnodoubtthathikingisgoodfortheretiredcouple,butitremainstobeseenwhethertheywillenjoyit.句中哪个是逻辑主语?

题目详情
There is no doubt that hiking is good for the retired couple,butit remains to be seen whether they will enjoy it.句中哪个是逻辑主语?
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答案和解析
that 后面的部分